[issue15502] Meta path finders and path entry finders are different, but share an ABC

[Brett Cannon]

Brett Cannon added the comment:

In terms of invalidate_caches(), it could easily be changed to walk sys.meta_path and to call the method on the meta path finders. Not sure if that generalization is reasonable or not, though.

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<http://bugs.python.org/issue15502>
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